http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
내연기관 흡기 계통의 Plenum Chamber의 유동 해석 모델에 관한 연구
윤건식,윤영환,우석근 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-
In this paper, the simulation models were examined to represent the flow through the plenum chamber in the intake system of MPI spark ignition engine. The constant-pressure perfect-mixing model or branch model which had been devised originally to represent the flow through the manifold branch system was tested. The constant-volume model or tank model also applied and the results were compared with those of the branch model. The prediction accuracies showed no remarkable differences between two models. Therefore, both models would be applicable successfully to represent the flows at the plenum chamber.
허건식,김영학 龍仁大學校 武道硏究所 1999 武道硏究所誌 Vol.10 No.1
In order to examine the state of before-introduction of Keomdo as a competition in Korea, this study closely explored the general contents such as the types, methods and meanings of swordmanship per the times in the historical background in Korea and inquired into the characteristics of the developmental types. The looks of the swordsmanship before Kap O Kyung Jang were the means of symbol, crafts, selection of fit persons for higher positions, books of military arts, called as swordsmanship, art of fencing and controlling the sword, and used the method of sticking as striking and sticking type. The swordsmanship at this time, was used as means of symbol, crafts, selection of fit persons for higher positions and military defence, and used swords said to be an suthentic sword as its instrumental, and the judgement its technique was subjective. These swordsmanship can be said to be swordsmanship in actual fighting composed of various swordsmanship created by China, Japan, in the nation.
尹健植,金容鎭 國立 昌原大學校 産業技術硏究所 1995 産技硏論文集 Vol.9 No.-
In this study, the performance tests for gasoline engine were carried out in order to analyze the energy losses in the cases of a naturally aspirated engine and a turbocharged engine. The test engine was domestic 4-cycle 3-cylinder gasoline engine of a light passenger car. The variation of cylinder pressure with crank angle was measured by piezoelectric pressure transducer in order to examine the variation of the indicated work and pumping loss. The mechanical losses were obtained by the comparison of the indicated work and brake work measured using engine dynamometer. The energy losses to cooling water and exhaust gas were also measured. These tests were carried out over the wide range of operating conditions to give a consideration of energy losses in gasoline engine with respect to the variations of engine speed and boost pressure.
공기과잉율의 변화가 에탄올 혼합연료 기관의 배기 특성에 미치는 영향
윤건식,박대곤 창원대학교 산업기술연구소 2001 産技硏論文集 Vol.15 No.-
Ethanol is an attractive alternative fuel for automotive engine to overcome the limit of petroleum resources and pollution problems. Ethanol contains oxygen in itself and has ability to improve thermal efficiency owing to higher octane number than gasoline. Also it can be used as clean fuel for low emissions. The effect of gasoline-ethanol blends on the performance characteristics including exhaust emission of the MPI gasoline engine were examined. The experiments were carried out over the various air-fuel ratio. The blending rates of ethanol were selected as 10 to 30 percent according to the analysis of the properties of blended fuels. The emission characteristics of ethanol-blended fuels showed the similar trend with those of gasoline fuel, in general. Any observable quantitative differences in concentration of nitric oxides and carbon monoxide were not seen when the blended fuels were used, while the concentration of hydrocarbon is slightly reduced by the use of ethanol blended fuels compared with gasoline fuels.
輕乘用車用 小形 가솔린 機關의 터보 過給化에 따른 性能特性에 관한 硏究
尹健植,羅旭洙 國立 昌原大學校 産業技術硏究所 1995 産技硏論文集 Vol.9 No.-
In this study, as a means of increasing engine power, a turbocharger was equipped to gasoline engine of a light passenger car which was naturally aspirated. The turbocharger was located at the upstream of the carburetor for least modification to the engine. The carburetor was equipped with pressure compensation device of float chamber and sealed with O-ring for preventing the leakage. The fuel pump was modified to compensate delivery pressure by the compressor outlet pressure. The lubrication oil to turbocharger was supplied from the engine oil system. The comparison of performances between the turbocharged engine and the naturally aspirated engine was made over the wide range of operating conditions. The results showed considerable increase of brake torque and output at full load condition by turbocharging.
윤건식,윤영환,서문진 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-
This paper presents the examination of the various simulation models to represent the flow through the exhaust system in the internal combustion engines. Three models - adiabatic pressure loss model, sudden enlargement and sudden contraction model and the constant volume model - have been examined theoretically and experimentally to represent the flow through the catalytic converter and the muffler. This study shows that the combination of the sudden enlargement-sudden contraction model for the catalytic converter and the constant volume model for the muffler gives the best results.
윤건식,신흥한,우석근 창원대학교 산업기술연구소 2001 産技硏論文集 Vol.15 No.-
In this study, the calculation of the behavior of gas in the intake and exhaust system of the multi-point injection SI engine has been accomplished under various operating conditions. The generalized method of characteristics including friction, heat transfer, area change and entropy gradients was used to analyze the pipe flow. The simulation models were selected not to depend much on the empirical constants. The constant-pressure model and the constant-volume model were compared to analyze the gas behavior in the plenum chamber in intake system. Through the comparison of predicted results with experiments, the simulation program was verified by showing good prediction of the behavior of IC engine qualitatively and quantitatively over the wide range of operating conditions.
이건범,정회민,편영식,주상윤 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.1
In order to increase the modeling power and productivity of CAD/CAM systems, demands for customization of CAD/CAM system increased. Customization of a CAM system involves making it easier to learn and use, adding new modeling features not supported in a general purpose CAM system, and providing parametric inputting mechanisms. A customization from a commercial CAM system (OMEGA) has implemented for two dimensional free curve CNC glass scribing machine of medium size company in Cheonan. A CAD technician who has no CAM experience can operate this customized CAM system satisfactorily.